package com.global.gbinventory.barang.util;

import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Image;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.io.File;

import javax.swing.ImageIcon;
import javax.swing.JComponent;
import javax.swing.JFileChooser;

public class ImagePreview extends JComponent implements PropertyChangeListener{

	private static final long serialVersionUID = 1L;

	ImageIcon thumbnail = null;
	File file = null;
	
	public ImagePreview(JFileChooser fc){
		setPreferredSize(new Dimension(100, 50));
		fc.addPropertyChangeListener(this);
	}
	
	public void loadImage(){
		if(file == null){
			thumbnail = null;
			return;
		}
		
		//Don't use createImageIcon (which is a wrapper for getResource)
		//because the image we're trying to load is probably not one
		//of this program's own resources
		ImageIcon tmpIcon = new ImageIcon(file.getPath());
		if(tmpIcon != null){
			if(tmpIcon.getIconWidth() > 90){
				thumbnail = new ImageIcon(tmpIcon.getImage().getScaledInstance(90, -1, Image.SCALE_DEFAULT));
			}else{ //no need to miniaturize
				thumbnail = tmpIcon;
			}
		}
	}
	
	@Override
	public void propertyChange(PropertyChangeEvent evt) {
		boolean update = false;
		String prop = evt.getPropertyName();
		
		//If the directory changed, don't show an image
		if(JFileChooser.DIRECTORY_CHANGED_PROPERTY.equals(prop)){
			file = null;
			update = true;
		}
		
		//If a file became selected, find out which one
		else if(JFileChooser.SELECTED_FILE_CHANGED_PROPERTY.equals(prop)){
			file = (File) evt.getNewValue();
			update = true;
		}
		
		//Update the preview accordingly
		if(update){
			thumbnail = null;
			if(isShowing()){
				loadImage();
				repaint();
			}
		}
	}
	
	@Override
	protected void paintComponent(Graphics g) {
		if(thumbnail == null){
			loadImage();
		}
		
		if(thumbnail != null){
			int x = getWidth() / 2 - thumbnail.getIconWidth() / 2;
			int y = getHeight() / 2 - thumbnail.getIconHeight() / 2;
			
			if(y < 0){
				y = 0;
			}
			
			if(x < 5){
				x = 5;
			}
			
			thumbnail.paintIcon(this, g, x, y);
		}
	}

}
